<script lang="ts" setup>
  import { computed, PropType } from 'vue';
  import { RouteRecordRaw } from 'vue-router';
  import { isExternal } from '/@/utils/validate';
  import path from 'path-browserify';
  import SidebarItemLink from './SidebarItemLink.vue';

  const props = defineProps({
    item: {
      type: Object as PropType<RouteRecordRaw>,
      required: true
    },
    isCollapse: {
      type: Boolean,
      required: false
    },
    isFirstLevel: {
      type: Boolean,
      default: true
    },
    basePath: {
      type: String,
      required: true
    }
  });

  const alwaysShowRootMenu = computed(() => {
    return !!(props.item.meta && props.item.meta.alwaysShow);
  });
  const showingChildNumber = computed(() => {
    if (props.item.children) {
      const showingChildren = props.item.children.filter(item => {
        return !(item.meta && item.meta.hidden);
      });
      return showingChildren.length;
    }
    return 0;
  });
  const theOnlyOneChild = computed(() => {
    if (showingChildNumber.value > 1) {
      return null;
    }
    if (props.item.children) {
      for (const child of props.item.children) {
        if (!child.meta || !child.meta.hidden) {
          return child;
        }
      }
    }
    // If there is no children, return itself with path removed,
    // because this.basePath already contains item's path information
    return { ...props.item, path: '' };
  });

  const resolvePath = (routePath: string) => {
    if (isExternal(routePath)) {
      return routePath;
    }
    if (isExternal(props.basePath)) {
      return props.basePath;
    }
    return path.resolve(props.basePath, routePath);
  };
</script>

<template>
  <div v-if="!item.meta || !item.meta.hidden" :class="{ 'simple-mode': isCollapse, 'first-level': isFirstLevel }">
    <template v-if="!alwaysShowRootMenu && theOnlyOneChild && !theOnlyOneChild.children">
      <SidebarItemLink v-if="theOnlyOneChild.meta" :to="resolvePath(theOnlyOneChild.path)">
        <el-menu-item :index="resolvePath(theOnlyOneChild.path)">
          <el-icon v-if="theOnlyOneChild.meta.icon">
            <component :is="theOnlyOneChild.meta.icon"></component>
          </el-icon>
          <svg-icon v-if="theOnlyOneChild.meta.svgIcon" :name="theOnlyOneChild.meta.svgIcon" />
          <template v-if="theOnlyOneChild.meta.title" #title>
            {{ theOnlyOneChild.meta.title }}
          </template>
        </el-menu-item>
      </SidebarItemLink>
    </template>
    <el-sub-menu v-else :index="resolvePath(item.path)" popper-append-to-body>
      <template #title>
        <el-icon v-if="item.meta && (item.meta.icon || item.meta.svgIcon)">
          <component :is="item.meta && item.meta.icon" v-if="item.meta.icon"></component>
          <svg-icon v-if="item.meta.svgIcon" :name="item.meta.svgIcon"></svg-icon>
        </el-icon>
        <span v-if="item.meta && item.meta.title">{{ item.meta.title }}</span>
      </template>
      <template v-if="item.children">
        <sidebar-item
          v-for="child in item.children"
          :key="child.path"
          :item="child"
          :is-collapse="isCollapse"
          :is-first-level="false"
          :base-path="resolvePath(child.path)"
        />
      </template>
    </el-sub-menu>
  </div>
</template>

<style lang="scss" scoped>
  .simple-mode {
    &.first-level {
      ::v-deep(.el-sub-menu) {
        .el-sub-menu__icon-arrow {
          display: none;
        }

        span {
          visibility: hidden;
        }
      }
    }
  }
</style>
